JPS632188A - Continuity mechanism for door part in cassette player or the like - Google Patents

Abstract

PURPOSE:To surely prevent damage of an electronic component by using a lead wire to connect a support shaft of an open/close door to the earth part of a chassis thereby grounding static electricity to the chassis at the entrance. CONSTITUTION:The earth part 11 provided to the support shaft 5 of the open/ close door 4 and the bottom of the chassis 2 is connected by an earth lead wire 10. Thus, when a cassette A is brought into contact with the open/close door 4 and further pushed, the static electricity charged on a human body is discharged from a printed circuit board 8 to the support shaft 5 of the door close to the human body and grounded to the chassis 2 through the earth lead wire 10. Thus, electronic components on the printed board 8 are protected from electrostatic destruction.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention prevents static electricity from being charged on the human body during operation in a cassette player, etc., which has an opening for inserting and removing a cassette. This invention relates to a conduction mechanism that prevents air from entering the circuit.

[Conventional technology]

Figures 8 and 4 show the conventional power conduction mechanism.
In the figure, 1 is a panel fitted to the front end of the chassis 2, and an opening 3 for inserting and removing the cassette A is formed in the center of the front surface. 04 is an opening/closing panel located inside the opening 3. The top end of the door is supported by a spindle 5 so that it can be opened and closed, and this spindle 5 has a third opening and closing mechanism.
Spring 6 for restoring and holding the opening in the closed position shown in the figure.
is being covered. Reference numeral 7 designates a grounding plate attached along the inner lower surface of the panel 1, the top end of which is located at the lower edge of the opening 3 and is brought into contact with the opening/closing n4. In addition, 8 in the figure is a printed circuit board with electronic components such as a microcomputer attached, and 9
is a Detsuki cassette holder.

The conventional device is constructed as described above, and as shown in FIG. [7 Problems to be Solved by the Invention] In the conventional conduction mechanism as described above, the electronic components in the printed circuit board 8 are protected from electrostatic damage. A special ground plate 7 is installed along the inner wall surface, which makes the structure even better! The problem is that it becomes sloppy and increases costs.T:
, 1. l This invention was made to solve this problem, and aims not only to eliminate static electricity at the opening/closing part, but also to provide a conduction mechanism that is as simple as possible.

[Means for solving intervening points]

In the door conduction mechanism according to the present invention, the pivot shaft of the opening/closing door is connected to the ground section of the chassis by a lead, so that static electricity is artificially transferred to the chassis.

[Effect]

In this invention, static electricity charged on the human body falls from the opening/closing door to the chassis via its spindle and lead wire.
Damage to electronic components is reliably prevented.

〔Example〕

FIGS. 1 and 2 are cross-sectional views showing one embodiment of the present invention, excluding the ground plate 7 (the parts indicated by numerals 1 to 9 are exactly the same as the conventional one described above). In the figure, lO is an earth lead connecting the support shaft 5 of the opening/closing door 4 and the earth ill provided in the bottom plate of the chassis 2. In this case, the support shaft 5 is made of a material to which the earth lead 10 can be soldered. The surface of the earth lead 10 shall be subjected to a surface treatment that allows soldering (IJ) or soldering, and the end of the earth lead 10 is fixed using a screw. In addition, earth lead 1
For the wiring of 0, an appropriate location is selected that does not obstruct the insertion and removal of cassette A.

In the above configuration, when the cassette (A) is brought into contact with the opening/closing door 4 and further pushed in, the static electricity charged on the human body is discharged from the printed circuit board 8 to the support shaft 5 of the door, which is closer to the human body, and this causes the earth lead 10 The electronic components inside the printed circuit board 8 are therefore protected from electrostatic discharge damage. The present invention can also be applied to other video decks, compact discs, etc., and similar effects can be obtained. :f7S: It is even more effective if the opening/closing door 4 is made of metal material.

〔Effect of the invention〕

As explained above, this invention uses a simple 72 structure that connects the pivot of the opening/closing door and the chassis with a ground lead, which allows electronic components to be reliably protected and eliminates the need for a conventional ground plate. Therefore, not only the structure but also the manufacturing and assembly are simplified and costs are reduced.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, FIG. 2 is a cross-sectional view showing the state when the cassette is inserted in FIG. 1, and FIG.
The figure is a sectional view showing the conventional mechanism, and Figure 4 shows the state when the cassette is inserted in Figure 3. It is a T-side view. In the figure, 1 is a panel, 2 is a chassis, 3 is an opening,
4 is an opening/closing door, 5 is a support shaft, and 10 is an earth lead. Incidentally, the same reference numerals in the drawings indicate directions or corresponding parts.

Claims (1)

[Claims] Continuity of the door in a cassette player, etc., which has an opening for inserting and removing a cassette in the front of the panel and an opening/closing door inside the opening, and the support shaft of the door and the chassis are connected by a ground lead. mechanism.